sebastian323
Member
- Joined
- Aug 2, 2021
- Messages
- 108
- Reaction score
- 24
- Points
- 18
- Location
- Merced, CA, USA
- Vehicle Year
- 1996
- Make / Model
- Ranger XLT
- Engine Type
- 4.0 V6
- Transmission
- Manual
- 2WD / 4WD
- 4WD
I have a 1996 Truck with factory AC, so I will use this thread to take some notes on how I get the system operational again and ask for advice
The first step has been to inspect the various components of the system to see what works and what does not. I will divide this into a few section
AC system - sensors, compressor, leaks, fuses, pressure sensors
Interior Electronics - blend door, HVAC control unit
*Blend door - the blend door motor makes an electronic motor noise when I turn the knob, but I cannot seem to get cool air from the system. I only seem to be able to get warm air, so I assume the motor is good (no weird clicking noises) and the blend door is bad.
*HVAC control unit - the unit sends voltage to the blend door and causes the blend motor to move so it seems to be working.
Vacuum controls - heater core bypass valve, HVAC directional controls - all seems to be fully functional
* The heater core bypass valve works - the air blows cooler when I have max AC on (but still stuck from the blend door)
*The max AC switch does close the vent allowing only internal air to be recirculated
*The HVAC directional controls indeed do change where the air comes out from
Diagrams:
Blend door pinout 1996 Ranger:
bk - black - ground
g/y - gray - power from fuse 10 in cabin fuse box
other 3 wires - potentiometer pinout
The first step has been to inspect the various components of the system to see what works and what does not. I will divide this into a few section
AC system - sensors, compressor, leaks, fuses, pressure sensors
Interior Electronics - blend door, HVAC control unit
*Blend door - the blend door motor makes an electronic motor noise when I turn the knob, but I cannot seem to get cool air from the system. I only seem to be able to get warm air, so I assume the motor is good (no weird clicking noises) and the blend door is bad.
*HVAC control unit - the unit sends voltage to the blend door and causes the blend motor to move so it seems to be working.
Vacuum controls - heater core bypass valve, HVAC directional controls - all seems to be fully functional
* The heater core bypass valve works - the air blows cooler when I have max AC on (but still stuck from the blend door)
*The max AC switch does close the vent allowing only internal air to be recirculated
*The HVAC directional controls indeed do change where the air comes out from
Diagrams:
Blend door pinout 1996 Ranger:
bk - black - ground
g/y - gray - power from fuse 10 in cabin fuse box
other 3 wires - potentiometer pinout
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